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What historical crime do the musicians witness in Some Like It Hot?

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Billy Wilder poses in a suit and hat, leaning against a streetlamp with a sign reading Sunset Blvd. in a promotional photo for the film Sunset Boulevard. — Billy Wilder Billy Wilder in a promotional photograph for *Sunset Boulevard* (1950), which he directed.

In the 1959 film Some Like It Hot, the two musicians witness a gangland killing that is based on the real-life St. Valentine’s Day Massacre of 1929. After accidentally seeing this crime, they are marked for death by gangsters and go into hiding by disguising themselves as members of an all-woman band.12